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Combinatorics Unsolved Problems
Problems you couldn't solve and to which you know that there is a solution (i.e. a problem from a contest, etc.) but you don't know it.
Moderators:
High School Olympiad Moderators
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darij grinberg
,
freemind
,
Megus
,
N.T.TUAN
,
orl
,
pbornsztein
3712
13328
USAMO question
Today, at 7:26 am
dysfunctionalequations
Combinatorics Proposed & Own Problems
Problems that you have already solved and you are interested in second opinions or solutions.
Moderators:
High School Olympiad Moderators
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darij grinberg
,
freemind
,
Megus
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N.T.TUAN
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orl
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pbornsztein
2324
8430
A Mixed Function Equation
Yesterday, at 11:24 pm
pmvald
Combinatorics Open Questions
An open question is a question that has no known solution up to this moment, and it is not known wheter the problem has one or not.
Moderators:
High School Olympiad Moderators
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darij grinberg
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orl
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pbornsztein
241
808
Operations on an array
Mon Nov 23, 2009 2:47 pm
kevinatcausa
Combinatorics Solved Problems
The problems that were discussed and solved in the topics above are moved here.
Moderators:
High School Olympiad Moderators
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darij grinberg
,
freemind
,
Megus
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N.T.TUAN
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orl
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pbornsztein
246
1249
colouring the plane
Tue Dec 01, 2009 2:39 am
Melvinlh5
Combinatorics Theorems and Formulas
Theorems and Formulas. Some even with proof :)
Moderators:
High School Olympiad Moderators
,
darij grinberg
,
freemind
,
Megus
,
N.T.TUAN
,
orl
,
pbornsztein
95
300
permutation.
Yesterday, at 5:56 am
ayush_2008
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